react

反応する

聞いたことや経験したことに応じて、行動したり何かを感じたりする。

やさしい英語で： If you hear or experience something, you do or feel something because of it.

• How did he react to the news?
• She reacted calmly when the alarm sounded.
• People react differently to criticism.

使い方： react to someone/something (The children reacted well to their new teacher.); react by doing something (He reacted by walking out.); react with something (She reacted with surprise to the invitation.)

類義語： respond

よく使う表現： react to something, react with surprise, react quickly, react with anger

反応する

薬や食べ物などの物質によって、体に変化が起こる。

やさしい英語で： Your body changes in some way because of a medicine, food, or other substance.

• My skin reacts badly to this soap.
• She reacted to the medicine with a rash.
• Does your body react to certain foods?

使い方： react to something (His skin reacts to some washing powders.)

類義語： respond

よく使う表現： react to medicine, react badly, react to something

反応する

物質が触れ合って変化し、多くの場合、別の物質ができる。

やさしい英語で： Substances change when they meet, often producing different substances.

• Iron can react with oxygen.
• The chemicals reacted and released gas.
• Scientists react the two substances under controlled conditions.

使い方： react with something (The metal reacts with water.); react to form something (These substances react to form a new compound.)

よく使う表現： react with oxygen, react with something, react to form

反作用する

力を加えてきた物体に、反対向きの力を加える。

やさしい英語で： An object pushes back against another object that applies a force to it.

• The wall reacts against the force of the ladder.
• Each body reacts on the other with an equal force.
• The support reacted against the downward load.

使い方： react against something (The spring reacts against the applied force.); react on something (The floor reacts on the box with an upward force.)

類義語： push back

よく使う表現： react against something, react on something

リアクション

ネットの投稿に対する気持ちを表すために付ける絵文字。

やさしい英語で： An emoji added to an online post to show how you feel about it.

• I left a sad react on her post.
• The video got hundreds of laughing reacts.
• Why did you give my photo an angry react?

類義語： reaction

よく使う表現： a sad react, an angry react, a heart react